Progeria pathophysiology
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Vamsikrishna Gunnam M.B.B.S [2]
Overview
It is thought that Hutchinson-Gilford progeria is the result due to mutation in LMNA gene.
Pathophysiology
Pathogenesis
- It is understood that Hutchinson-Gilford progeria is the result due to mutation in LMNA gene.[1]
Genetics
Genes involved in the pathogenesis of Hutchinson-Gilford progeria syndrome (HGPS) include:[2]
LMNA Gene
Classic Hutchinson-Gilford progeria syndrome
- The location of the Hutchinson-Gilford progeria syndrome (HGPS) gene was in chromosome 1q.[3][4]
- A single nucleotide substitution in the lamin A/C gene LMNA(c.1824C>T [p.Gly608Gly]) results in classic HGPS.[5][6]
- The mutation does not change the position of glycine at 608 in protein chain.
- De novo dominant mutation in the LMNA gene causes classic HGPS.
- A single de novo dominant mutation at C to T pathogenic variant at located in exon 11, C1824T of the LMNA gene results in activation of a cryptic splice donor site.[7]
- Now at cryptic splice donor site there is formation of a messenger RNA with a 150-nucleotide internal deletion near the C-terminus of the chain.
- The resultant of the mutation leads to formation of short lamin A protein which is called progerin.
- Progerin has a 50-amino acid internal deletion alon with CAAX box farnesylation site due to de novo dominant mutation.
- Now the progerin which has 50-amino acid misses cleave site due to internal deletion which results in continuous farnesylation which in turn results in progerin anchored to the nuclear envelope.[8]
- This continuous farnesylation thought be the cause of the disease and results in following changes:
- Nuclear blebbing
- Disorganized heterochromatin
- Dysregulated gene transcription
- This whole unexpected sequences in the cell leads to genomic instability and may leads to premature aging and disease in Hutchinson-Gilford progeria syndrome.[9]
- And it is also thought that in Hutchinson-Gilford progeria syndrome telomere length is decreased gradually.[10]
Associated Conditions
Conditions associated with [disease name] include:
- [Condition 1]
- [Condition 2]
- [Condition 3]
Gross Pathology
On gross pathology, [feature1], [feature2], and [feature3] are characteristic findings of [disease name].
Microscopic Pathology
On microscopic histopathological analysis, [feature1], [feature2], and [feature3] are characteristic findings of [disease name].
References
- ↑ Pollex RL, Hegele RA (2004). "Hutchinson-Gilford progeria syndrome". Clin Genet. 66 (5): 375–81. doi:10.1111/j.1399-0004.2004.00315.x. PMID 15479179.
- ↑ Pollex RL, Hegele RA (2004). "Hutchinson-Gilford progeria syndrome". Clin Genet. 66 (5): 375–81. doi:10.1111/j.1399-0004.2004.00315.x. PMID 15479179.
- ↑ Eriksson M, Brown WT, Gordon LB, Glynn MW, Singer J, Scott L; et al. (2003). "Recurrent de novo point mutations in lamin A cause Hutchinson-Gilford progeria syndrome". Nature. 423 (6937): 293–8. doi:10.1038/nature01629. PMID 12714972.
- ↑ Decker ML, Chavez E, Vulto I, Lansdorp PM (2009). "Telomere length in Hutchinson-Gilford progeria syndrome". Mech Ageing Dev. 130 (6): 377–83. doi:10.1016/j.mad.2009.03.001. PMID 19428457.
- ↑ Pollex RL, Hegele RA (2004). "Hutchinson-Gilford progeria syndrome". Clin Genet. 66 (5): 375–81. doi:10.1111/j.1399-0004.2004.00315.x. PMID 15479179.
- ↑ Cao H, Hegele RA (2003). "LMNA is mutated in Hutchinson-Gilford progeria (MIM 176670) but not in Wiedemann-Rautenstrauch progeroid syndrome (MIM 264090)". J Hum Genet. 48 (5): 271–4. doi:10.1007/s10038-003-0025-3. PMID 12768443.
- ↑ Madej-Pilarczyk A (2006). "[Hutchinson-Gilford progeria in the light of contemporary genetics]". Med Wieku Rozwoj. 10 (1 Pt 2): 355–62. PMID 17028399.
- ↑ Glynn MW, Glover TW (2005). "Incomplete processing of mutant lamin A in Hutchinson-Gilford progeria leads to nuclear abnormalities, which are reversed by farnesyltransferase inhibition". Hum Mol Genet. 14 (20): 2959–69. doi:10.1093/hmg/ddi326. PMID 16126733.
- ↑ Csoka AB, English SB, Simkevich CP, Ginzinger DG, Butte AJ, Schatten GP; et al. (2004). "Genome-scale expression profiling of Hutchinson-Gilford progeria syndrome reveals widespread transcriptional misregulation leading to mesodermal/mesenchymal defects and accelerated atherosclerosis". Aging Cell. 3 (4): 235–43. doi:10.1111/j.1474-9728.2004.00105.x. PMID 15268757.
- ↑ Allsopp RC, Vaziri H, Patterson C, Goldstein S, Younglai EV, Futcher AB; et al. (1992). "Telomere length predicts replicative capacity of human fibroblasts". Proc Natl Acad Sci U S A. 89 (21): 10114–8. doi:10.1073/pnas.89.21.10114. PMC 50288. PMID 1438199.